Phacelia heterophylla Pursh. Common name Phacelia. A common flower of Zion. Flowers white and slightly tinged with blue.

Chicago citation style
Department of the Interior. National Park Service. (8/25/1916 - 8/10/1933). Phacelia heterophylla Pursh. Common name Phacelia. A common flower of Zion. Flowers white and slightly tinged with blue.. 1929-09-02. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/520511. (Accessed September 19, 2018.)
APA citation style
Department of the Interior. National Park Service. (8/25/1916 - 8/10/1933), (1929-09-02) Phacelia heterophylla Pursh. Common name Phacelia. A common flower of Zion. Flowers white and slightly tinged with blue.. Retrieved from the Digital Public Library of America, http://catalog.archives.gov/id/520511
MLA citation style
Department of the Interior. National Park Service. (8/25/1916 - 8/10/1933). Retrieved from the Digital Public Library of America <http://catalog.archives.gov/id/520511>.
Note: These citations are programmatically generated and may be incomplete.